QSB:
for
use ,
Infrared opposed mode fiber optic sensor heads;
for use with Banner glass fiber optic assemblies
OSBEFnnd OSBRF rmrar Aeadr shown with individrral glassfiber
oprlc as.remblre.~
amchcd, and mounted OR quick-drsconncct (QD)
style dc power blocks
Use with OMNI-BEAMm power blocks and op-
tional logic modules
The Banner OMNI-BEAMThfmodels OSREF emitter and
OSBRF receiver are an infrared opposed-mode fiber optic
sensor pair, compatible with Banner individual glass fiberoptic assemblies. Because the receiver and emitter are separate
units, they are ideal for applications in which it is inconvenient
to route fiber optic assemblies to both sides of a process from
Opposed mode sensing ranges (fibers only, without lenses
added) are up to 6 inches w ~ t h1116-inch glass fibers and 13
inches with l/&inch glass fibers. Lenses may be added to I/
8-inch glass fibers on both the emltter and the receiver for
longer-range fiber optic sensing. There are two active fiber
optic pons on both the emitter and receiver. This allows two
pairsof o p p o ~ e fibers
d
10 be configured for "both par~spresent"
(two-channeI DARK AND) log~c.
The OSRRFreceiver features Banner's exclusive* D.A.T.A.m
sensor a l ~ g n m t n and
t self-diagnostic system which identifies
sensing problems and warns of them via a dedicated alarm
output. Also included are switchable lightldark operate, and
selectable sensing hysteresis and LED indicator array scale
factor. Receiver programming i s done via convenient DIP
switches inside the base of the OSBRF sensor head (page 2).
P.&,L,."
-.>-
The OSBEE and OSBRF each requlxe an OMNI-BEAM power
block to supply operating voltages and interface the receiver to
the circuit to be controlled and to external alarm circuitry (see
Power Block Module Information, below). Optional plug-in
timing logic modules (model OLM5 or OLM8) converts the
baslc ONIOFF OSBRF receiver to either a one-shot or a delay
t i m ~ n glogic control, with programmable timing ranges. See data
sheet P/N 03533 or the Banner catalog for further information
about logic capability.
Excess Gain Curves
Beam Patterns
clutched po~entiometer(rotate clockwise to Increase gain)
RESPONSE TIME (OSBRF receiver): 2 milliseconds onloff,
dependent of signal strength.
REFEATAnILITY of RESPONSE (OSRRF receiver): 0.01
rnillisccond, independent of ~ ~ g n strength.
al
1NX)ICATORS and ALARMS (OSBRF receiver): exclusive*
13.A.T.A.Th1system (Display and Trouble Alert), a J 0-eIement LED
~nstallcd) A separate alarm output signals marginal scnslng condlCONSTRUCTION: rupged. molded VALOX* thermoplast~c
polyester hous~ng Tramparent top wmdaw of Lexan*poIycarbonatc Acrylic lenses; sta~nlcss~ t e e lhardware When assembled, all
parts are fi13ly gasketed.
(-40 to + 158 degrees Fj.
PROTECTION (receiver): false-pulse suppression on power-up.
DELAY UPON POWER-UP (receiver): 200 rn~lliseconds,maximum (power block outpi~tsarc nun-conducting dtlring t h ~ stime).
standard OMNI-BEAM power blocks a n h .
*US patent no. 4965558
Printed in USA
PIN 03546AJA
r Sensor Head Programming
I
The OMNI-BEAM model OSRRE infrared f~beroptic receiver sensor head IS field-programrnablc for four operating parameters. A set of four
programming DIP switches is loca~edlnsidc the base of the scnsor head (see photo at right). and 1s accessible with the scnsor block removed
from thc power block.
Switch #1selects the amount of sensing Ilysrcresis. Hysteresis is an electronicsensor design
cons~derationwhich states that the amount of received light signal required to operatc the
sensor's output is not the same as the amount required to release the output. This differentla!
prevents the sensing output from "hu7ringWor "chattering" when a light signal at or near the
sensing threshold [eve! is detected.
Setting switch #1 to the "on"position programs the sensor head for "nomal" hysreresls. The
NORMAL setting is ordinarily used for average-to-h~ghcontrast sensing applications. The
LOW serri~lgis used for low-conrrasr siluarions like rke derection of subtle diflerences in
opaciry NOTE: when the "low" hysteres~ssetting is used (switch # 1 "off'), care must be
taken to ensure that all sensrng c o n d ~ t ~ o rernaln
ns
complefely stable.
Switch #2 selects the alarm output configuration. With switch #2 "on", the alarm output
is normally open (i. e., it conducts with an alarm). Turning switch #2 "off' programs the
alarm output f o normally
~
closed operation ( i t . , the output opens during an alarm).
The normally closed mode (switch #2 "off') is recommended. This allows a system controller to recognize
a sensor power loss or an open sensor output as an alarm condition. The normally open alarm mode (switch
#2 "on") should be used when the alarm outputs of multiple OMNI-BEAMS are wired in parallel to acommon
alarm or alarm input.
Swikh #3 seEects LIGHT operate (switch #3 "off"} or DARK operate (switch #3 "on"). In the LIGHT
operate mode, the OMN1-BEAM'S load output will encrpizc (after a time delay, if timing loglc IS employed)
when the reccivcd light level is greafer than the scnslnp threshold (t.e., when five or more D.A.T.A. lights
are ~llum~nated).In DARK operate. thc output will energize (after a time delay, if any) when the received
light level is less than the sensing threshold (i.e.. when four or less D.A.T.A. lights are illuminated).
-
HYST.
'Ow
SCALE
OFF
AtARM N/C
LIGHT OF.
For example, when senslng In the opposed {beam-break) mode:
1) The DARK operate mode would be used to energize the OMNI-BEAM'S output whenever an object is present, and blocking rht. beam.
2) The LIGHT operate mode would be used to energize the output whenever the beam is unblocked (i.e., object missing).
Switch #4 selects the STANDARD (switch #4 "off")or FINE (switch #4 "on") scale factor for the D.A.T.A. light signal strength indicator
array. Thls switch should always he in the "ofr' posilion, except for close differential sensing situations, like some color registration
applications, which also require the LOW hysteresis setting (switch #1 "off").
Factory DIP switch settings:
The following are the factory propram settings fur OMNI-BEAM OSBRF sensor beads.
Switch #1: "on"= normal hysteresis
Switch #2: 'bfr' =normally closed alarm output
Switch #4: "off'= standard scale factor for s ~ g a strength
l
mcter
Switch #3: "off' = light operale of load output
NOTE: Attachment of Lenses to Banner 5116"-24 Threaded Fiber Optic Assemblies
Lenses are somctimes added to fiber optic nssemblles fur extending opposed mode sensing range. Banner offers the following lens aqsernblies
for use with fiber optic assemblles having 5116"-24 threaded sensing tips (e.g. fiber model IT23S):
MODEL
E N S SIZE
LY
I2,5mm (1 /2")
Z5mm (1")
25mm (1 ")
25mm ( 1 ")
L16F
1,1 hFAL
1-16FSS
44rnrn ( 1.7")
44mm ( I 3 " )
44mm ( I .7")
Aluminum
DeIrin
Aluminum
Stamless steel
Lenses are most efficient whcn they are located slightly bcyond their
focal length distancc from thc sensing end of thc fiber optic bundle.
The easiest way to focus a lens is ro Ireat 11 likc a magnifying glass.
Illuminate thc fiber o p t i c bundle at thc rhrcadcd end of thc fiber optic
assemhly by directing the opposite end toward a visible light source
[e.g.- an incandescent bulb. visible LED. sunlight. ctc.). Thread the
lens onto the fibcroptic assembry until the end of the fiber optic bundle
comes into sharp focus under the lens. Then, hack off (unthread) the
lens assembly from the point o r sharpest focus by one to rhree full
turns. The illuminated bundle should now appear slightly blurred
This is the optimum setting, and thc lcns may be secured In posit~on
usmg one of the jam nuts provided. Refer 10thc drawing az the right.
A
1 \
"
,
.HOUSlNG
12.5mm (1/2")
NOTES
Suitable for all but highly corrosive enviranments
Maximum operating temperature is 100°C (21 2°F)
Suitable for all but highly corrosive environments
Suitable for alI environments
I
Rnd of Fiberoptic Bundle
Lens
J
S e n s i o ~Tip
Focal LentLh o f tens.
WARNING T h i s photwlcctr~cprescnce sensor dws NOT rnclude the self-checking redundant circuitry necessary to allow ik use in
personnel snrcly application\ h scnsor fa~lureor rnalfunctmn can result in attkcr nn energized or a de-energized sensor output condition
Never use thrs produc~as a scnsing dcvicc for personnel protection Its use as a safety device may create an unsafe condition whichcoutd lead
to serlous injury or dcath
Only MACHWEGUARD and PEYMETEK-GLIARD Systems. and other systems so designated, are designed to meet OSHA and ANSI machine safety
standards for point-of-operation guarding d e i ices N o other Banner sensors or controls are designed to meet rhese standards, and they must NOTbe used as
sensing devices For personnel protection.
I
I
D.A.T.A:" Sensor Self-diagnostic System
diagnostic system warns-of a problem by flashing one or morc lights in a
multiple-LED array, and by sending a warning signal to the system loplc
controller (or directlv 10 an audible or visuaI alarm) by* way
of the OSBRF's
.
dedicated alarm output.
1
h
The D.A.T.A. lights are located on the top of the scnsor head and are viewed
through a transparent LEXANmcover. The D.A.T.A. lights are conf~guredas
follows:
AIert: Severe moisture inside the sensor
caused
,O'\Moisture
condensation or by entry of mo~srure
the access cnver is
# I light to flash
removed, will cause
\
head,
when
by
the
High Temperature Alert: Whcn the temperature i n s f d the
~ sensor
head exceeds 70°C (+15X°F), thc #2 Ilght will flash.
'O/
,,
LOWVoltage or Overload Alert: The number #3 light will flash whenever the sensor supply voltage drops below the minimum
that is specified for the power block in use (sec power block specif cations). Power block outputs are also shut down to prevent damage
to the lead(s) from Iow voltapc.
When using dc power block modcls OPBT2, OPBTZQD. or OPBTZQDH, thc #3 light will flash if either the load output or the alarm output
hecomes shorted. Both ou~purswill be i n h ~ h ~ t eand
d , the circui t w1I1"retry" thc ourpuis every 1/10second. The outputs will autornaticalty reset
and funclion normally when the short is corrected.
\
/
High Gain Warning: The #9 light wlH flash illhe "dark" signal never goes below #4 on the dlsplay, and instruct the operator to
decrease the gain (see photo above) Thcrc are two possible conditions:
1) The Aigh Gain Warning alarm wiIl come "on" ~fthc "dnrk'>ignal slowly increases to the #4 level and remains at that level for a
predetermined dclay tlrne. The alarm will reset as soon as the cause of the unwanted light signal is removed, or if the GAIN control setting
is reduced to bnng the "dark" condition below !he ft4 Ievel.
2) The High Gain Warning alarm wlll latch "on" if the "dark" s ~ g n adocs
l
not fall below the #4 level during a sensing event. The alarm
is automatically reset o n any subsequent sensing event in which thc "dark" sensing level falls below the #4 level. This IS accompIished by
reducing the GAIN control setting andlor by removing the cause of the unwanted light return in the "dark" condition.
'0'
LOWGain Warning: The d l 0 light wlll flash if the +'lightn'signal ncver goes above #5 on ihe display, and instruct the operator to
/
increase the gain (sec photo. above). There are two possible conditions.
I ) The Low Gain Warning alarm will come "on" if the light signal slow1y decreases to thc #5 level and remains at that level for a
predetermined deIay tirnc. This siluation most commonly occurs in opposcd or rctroreflcctlve sensing systems, and is caused by a decrease
in light in the unblockedcondition (over time) due to obscured lensesorgradual.sensor misalignment. The alarm will reset as soon as the Iight
signal strength exceeds the #S Ievet.
2) The !,ow Gain Warning alarm will latch "on" ~fthc light signal does not exceed the #5 !eve1 during a sensing event. The alarm is
automatically reset by any subsequent scnsing event in which the "light" slgnal exceeds the #5 level. This is accomplished by increasing the
GAIN control sett~ngand/or hy lens cteaning and sensor realignment
/
\
9
/
+
\
'
\
/
Low Contrast Warning: The #9 and #10 D.A.T.A. lights wiEl flash simultaneously to indicate that there is not enough optical
conmast for rel~ablesensing. This occurs when the "light" conditim is at the RS level and the "dark" c o n d ~ ~ i oisnat the #d level for a
sensing event. If this wamlng occurs, the application should be fully re-evaluated to find ways to increase the differential between the
"light" and "dark" cond~tions.The L o r Contrast alarm is rvtornat~callyrcset by my subsequent sensing event in which the "li.ghrn'
signal exceeds the #5 level and the "dark" signal falls below the #4 Icvcl.
"SENSE" and "LOAD" Indicator LEDs
SENSE
The "SENSE" LED indicates when a target has becn scnscd. When the sensoshcad IS programmed for LIGHT operate, ~tlights when
thc sensor receives enough light to exceed thc #5 threshold Whcn programmed for DARK operate, it lights when the received signal
falls below the #5 ihreshold. The "SENSE" LED 1s locamd at the far len end of the D.A.T.A. array.
*
The "LOAD" indicator LED lights whenever the load is cnerg~red(after he riming Function, ~f any). The "LOAD" LED is located
the far right end of thc D.A.T.A. array.
'0:
/
LOAD
The SENSE and LOAD indicator
LED Eoca~ionsare visible I n the photograph above
- Measuring Excess Gain and Contrast
The OSBRF receiver's D.A.T.A. lights may be uscd to measure the
excessgain andcontrasf in any sensing situation and during installation
and maintenance.
Excess gain:is a measurement of the amount of light energy falling
on the receiver of a photoelectric sensor over and abow i k rnininlrrm
~
amount necessary ro operate rAe sensor's arnpifler. Excess gain 1s
expressed as a ratio:
The amplifier threshold is the point at which thc sensor's output
switches. The OMNI-BEAM'Sthreshold corresponds to the #5 level of
the D.A.T.A. light arrav. That is. when LEDs # I through #5 arc Iit. the
cxcess gain of the received light signal is equal to " lx"'.
The table below (Relatiosslrip between F c e s s Grin and 0A.T.A.
System lights) shows how excess gain relates to thc D.A.T.A. l i g h ~
array indication.
Excess gain (E.G.) = light encrgy fdling on rcceivcr
ampl~ficrthreshold
.
Relationship between Excess Gain and D.A.T.A. System Lights
D.A.T.A. light
1,BD number
#1
0.25~
E.G.
#2
#3
0.35~
0.5~
0.7~
1 .Ox
#4
#5
I
STANDARD
scale Factor
FINK*
D.A.'E'.h. light
STANnAFW
scale fartor
FINIS*
scale factor
LED number
0.5~
E.G.
0.7~
0.Xx
0.9~
1.Ox
#6
87
1.3~
1.7~
1.lx
1.2~
ft8
2.2~
2.9~
1.3
1 .Tx
3 . 7 ~(or more)
2 . 2 for
~ more)
#9
#I0
scale factor
*NOTE:the scale factor is selected by programming switchM inside thc sensor head (see pagc 2). "OFF" = STANDARD. "ON"= FlNE Use the FINE scale
only for setup and monitoring of close-d~tferentialsensing applications where LOW hysteresis is required
Contra~fis the ratio of the amount of light falling on the receiver In
the "liehi" state ascorn~aredto the "darkkp
s t a t . Contrrsr is also referred
to as "light-to-dark ratio". Optimizing the contrast In any sensing
situation will increase the reliability of the sensmg system. Contrast
may be calculated if excess gain values are known for both the light and
dark conditions.
L
I
1.2 or less
To determine the contrast for any sensing application, present both the
"light" and "dark" conditions t o the OMNI-BEAM, and read the
D.A.T.A. signal for each. Take the ratio of the two numbers {fmm the
table above) that correspond to the hi.ghes.1 D.h.T.h. light numbers
registered for the "light" and "dark" conditions.
Recommendation
Unreliable. Evaluate alternative sensing
schemes.
1
Contrast =Excess gain (light condition)
Excess pain (dark condition)
and Corresponding Guidelines
Contrast
I
1.2 to2
Pnor contrast. Use the LOW hvsteresis
setting and the HNE scale fact&.
2103
Low contrast- Sensing environment must
remaln perfectly clean and all other sensing
vanablis must remain stahle
3 to 10
Good contrast. Minor sensing system
variables will not affect sensing rel~ability
10 or greater
contrast. Sensing should remain
reliable as long as the scnsinp system has
enough cxcess gain For operation.
For example, ~fLEDs # I thro~gh#& come "on" in
the "l~ght"condition and LEDs #I and #2 comc
"on" in the "dark" condition (as shown in the
pho~osat right), the contrast (refemng to rhe table
at the top of this page) is calculated as follows:
Contrast
=a
=6
0.35~
This value 1s expressed as "6:1 " or "six-to-one"
The h s t sensor adjustment will cause all ten
D.A.T.A. LEDs to come "on" for the "light"
cond~tion,and will cause no LEDs tocome "on" in
the "dark" condition. In this situation (such as an
application in which an 0 b ~ e nbreaks a the beam
of an opposed mode emitter and receiver):
Contrast is greater than
= 15: 1
0.25~
-
nple: I).A.? '.A. system
LIC;HT cnndi tlon cxanlplc E).r\.'T.h. sptr
Ofcourse.~t~snotalways posahle to adjust asensor tornaintaln thismuchcontrast. Howm
ii i.7 inlpnrlnnf ro alwnv.7 adjust a sensorfor the greatest anlorr~rrof conrrasr possibl~far L
sensing sifrrarion. The D.A.T.A. light system makes this easy. The Contmsf Values n
Correspondit~gGuidelines table (above) gives general guidelmes for contrast values.
WARWNTY: Ranner Engineerrng Corporation wilrnnts its products to be free From defects for one year. Ranner Ensinerrin? Corporation will rcpair or
replace, free of charge, any product of its manuracture foiknd ro he defective at the time it is rclumcd to the factory during (he uarrilnty pried T h ~ warranty
s
does not covcr damage or liability for the improper use of Bnnner prducls This warranty is in l~euof any other warranty either expres~edor implred.
Bnnner Engineering Corp
9714 10th Avc No.. Minneapolis, M N 55441
Telephone (612) 544-3164
FAX (app11cations)(612) 544-3573
I